21249728

21,249,728 is an even composite number composed of three prime numbers multiplied together.

What does the number 21249728 look like?

This visualization shows the relationship between its 3 prime factors (large circles) and 28 divisors.

21249728 is an even composite number. It is composed of three distinct prime numbers multiplied together. It has a total of twenty-eight divisors.

Prime factorization of 21249728:

2⁶ × 17 × 19531

(2 × 2 × 2 × 2 × 2 × 2 × 17 × 19531)

See below for interesting mathematical facts about the number 21249728 from the Numbermatics database.

Names of 21249728

Cardinal: 21249728 can be written as Twenty-one million, two hundred forty-nine thousand, seven hundred twenty-eight.

Scientific notation

Scientific notation: 2.1249728 × 10⁷

Factors of 21249728

Number of distinct prime factors ω(n): 3
Total number of prime factors Ω(n): 8
Sum of prime factors: 19550

Divisors of 21249728

Number of divisors d(n): 28
Complete list of divisors:
1 2 4 8 16 17 32 34 64 68 136 272 544 1088 19531 39062 78124 156248 312496 332027 624992 664054 1249984 1328108 2656216 5312432 10624864 21249728
Sum of all divisors σ(n): 44650152
Sum of proper divisors (its aliquot sum) s(n): 23400424
21249728 is an abundant number, because the sum of its proper divisors (23400424) is greater than itself. Its abundance is 2150696

Bases of 21249728

Binary: 1010001000011111011000000₂
Hexadecimal: 0x1443EC0
Base-36: CNGE8

Squares and roots of 21249728

21249728 squared (21249728²) is 451550940073984
21249728 cubed (21249728³) is 9595334654716459876352
The square root of 21249728 is 4609.7427260097
The cube root of 21249728 is 276.9817310389

Scales and comparisons

How big is 21249728?

21,249,728 seconds is equal to 35 weeks, 22 hours, 42 minutes, 8 seconds.
To count from 1 to 21,249,728 would take you about four days!

This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)
A cube with a volume of 21249728 cubic inches would be around 23.1 feet tall.

Recreational maths with 21249728

21249728 backwards is 82794212
The number of decimal digits it has is: 8
The sum of 21249728's digits is 35
More coming soon!

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The information we have on file for 21249728 includes mathematical data and numerical statistics calculated using standard algorithms and methods. We are adding more all the time. If there are any features you would like to see, please contact us. Information provided for educational use, intellectual curiosity and fun!

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